Imager 0.96_02

PNG: treat a version mismatch between headers and library as a probe failure. RT #86659

PNG: the check for benign error support is more complex than a simple library version check, check for the appropriate macro. Thanks for Slaven Rezic for following up on my CPAN Testers result queries. RT #86659

Imager 0.96_01

TIFF: handle SampleFormat = 2 by translating the signed integer values to unsigned by flipping their sign bits.
Handle SampleFormat = 3 where possible.
SampleFormat is ignored for paletted images.
Mixed SampleFormat are handled incorrectly, since libtiff returns only the first SampleFormat value, and an image with both an alpha channel and SampleFormat = 2 for color channels probably has a different SampleFormat for the alpha channel. RT #74540